Hardgrove Grindability Tester
Hardgrove Grindability Tester measures relative ease of pulverization of coals compared to standard coals in accordance with ASTM D409 Hardgrove Machine Method. The resulting Hardgrove Grindability Index (HGI) provides a measure of the energy required in a grinding process or a measure of yield for given energy input.
A prepared 50g sample of No. 16–No. 30 sieve size coal and eight 1in (25.4mm) diameter polished steel grinding balls are placed in a stationary bowl having a machined circular track. An upper grinding ring with a matching track is rotated at 20rpm to drive the balls while a fixed load of 64lb (29kg) is maintained by weighting the motor-driven spindle attached to the upper ring. A counter/switch assembly automatically stops the tester after 60 revolutions, and the amount of grinding is determined by sieving on a No. 200 sieve.
The unit is made from durable steel and cast iron materials throughout to ensure reliable, maintenance-free operation. Upper and lower grinding elements and 8 grinding balls are included with each model.
New Hardgrove units must be user-calibrated with a set of four Reference Samples having approximately 40, 60, 80, and 100 Hardgrove Grindability Index (HGI) values. The Motorized Disk Mill (available separately) meets ASTM requirements for sample preparation for the LC-100.
Features:
- Provides reliable and maintenance-free operation
- Meets ASTM D409 standards
Included Items:
- Hardgrove Grindability Tester (115V/60Hz or 230V/50Hz)
- Grinding Elements
- 8 Grinding Balls
Accessories:
- Reference Samples with four different HGI values for calibrating new grindability machine
- Grinding Balls for Hardgrove Grindability Tester used to help determine HGI of samples
Maximum Particle Size 0.04in (1mm)
Final Size 75µm
Max. Feed Capacity 50g/batch
Grinding Elements (8) 1in (25.4mm) Steel Grinding Balls
Electrical 115V/60Hz, 5 Amps, 1 Phase
Product Dimensions 20 x 16 x 16in (508 x 406 x 406mm), WxDxH
Estimated Weight 180.0lb (81.65kg)
Meets Test Method:
ASTM D 409, ISO 5074
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